Edinburgh Festival Theme
Anagrams first please :)
29A TIS FAIR MULL (1,6,4) I ?i?l?M ?t??
20A TEND MAD GROUP (12) ?r?m?a???d?n
12D COSTS NOT BIG (5, 6) S?o??? ?????
Also
5D A long time putting up third of units (4) E?N? looks like EONS but why?
30D Rude leader in Germany's northern district (5) ????S I was wondering CRASS?
Any help much appreciated